4000002444 has 36 divisors (see below), whose sum is σ = 10183871880. Its totient is φ = 1323740160.

The previous prime is 4000002439. The next prime is 4000002469. The reversal of 4000002444 is 4442000004.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 394677 + ... + 404684.

It is an arithmetic number, because the mean of its divisors is an integer number (282885330).

Almost surely, 2^4000002444 is an apocalyptic number.

It is an amenable number.

4000002444 is an abundant number, since it is smaller than the sum of its proper divisors (6183869436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

4000002444 is a wasteful number, since it uses less digits than its factorization.

4000002444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799510 (or 799505 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 4000002444 is about 63245.5725248811. The cubic root of 4000002444 is about 1587.4013752688.

Adding to 4000002444 its reverse (4442000004), we get a palindrome (8442002448).

The spelling of 4000002444 in words is "four billion, two thousand, four hundred forty-four".